Use `onDidCompleteDownloadingUpdate` in `listenForUpdates`
Use `onDidCompleteDownloadingUpdate` in `listenForUpdates`

This gets a bit confusing… It was formerly 
`@applicationDelegate.onUpdateAvailable`, but `::onUpdateAvailable` 
listens for the `did-begin-downloading-update` event and 
`::onDidCompleteDownloadingUpdate` listens for the `update-available` 
event. Note that ‘available’ here means successfully downloaded and 
ready to be used and NOT available to be downloaded. 

stinsonga/atom,bsmr-x-script/atom,me-benni/atom,scippio/atom,t9md/atom,Ingramz/atom,ardeshirj/atom,wiggzz/atom,jordanbtucker/atom,Austen-G/BlockBuilder,bj7/atom,bj7/atom,scippio/atom,florianb/atom,tjkr/atom,rlugojr/atom,stinsonga/atom,brumm/atom,liuderchi/atom,atom/atom,rlugojr/atom,xream/atom,AlexxNica/atom,Arcanemagus/atom,hellendag/atom,bolinfest/atom,tjkr/atom,brumm/atom,wiggzz/atom,wiggzz/atom,bolinfest/atom,scippio/atom,kevinrenaers/atom,AdrianVovk/substance-ide,AlexxNica/atom,stinsonga/atom,AdrianVovk/substance-ide,brettle/atom,sotayamashita/atom,ashneo76/atom,xream/atom,Mokolea/atom,florianb/atom,kevinrenaers/atom,t9md/atom,daxlab/atom,FIT-CSE2410-A-Bombs/atom,bj7/atom,helber/atom,decaffeinate-examples/atom,daxlab/atom,atom/atom,gontadu/atom,AdrianVovk/substance-ide,andrewleverette/atom,hellendag/atom,bsmr-x-script/atom,me-benni/atom,Austen-G/BlockBuilder,Austen-G/BlockBuilder,AlexxNica/atom,sotayamashita/atom,decaffeinate-examples/atom,brettle/atom,Austen-G/BlockBuilder,ardeshirj/atom,Arcanemagus/atom,johnhaley81/atom,Arcanemagus/atom,hellendag/atom,FIT-CSE2410-A-Bombs/atom,Ingramz/atom,jordanbtucker/atom,johnhaley81/atom,FIT-CSE2410-A-Bombs/atom,CraZySacX/atom,andrewleverette/atom,stinsonga/atom,PKRoma/atom,jordanbtucker/atom,florianb/atom,ashneo76/atom,helber/atom,t9md/atom,bsmr-x-script/atom,me-benni/atom,liuderchi/atom,helber/atom,daxlab/atom,xream/atom,andrewleverette/atom,ardeshirj/atom,atom/atom,johnhaley81/atom,gontadu/atom,florianb/atom,Mokolea/atom,ashneo76/atom,tjkr/atom,PKRoma/atom,Ingramz/atom,bolinfest/atom,decaffeinate-examples/atom,brettle/atom,brumm/atom,rlugojr/atom,sotayamashita/atom,liuderchi/atom,liuderchi/atom,kevinrenaers/atom,PKRoma/atom,florianb/atom,Austen-G/BlockBuilder,decaffeinate-examples/atom,CraZySacX/atom,gontadu/atom,CraZySacX/atom,Austen-G/BlockBuilder,Mokolea/atom